CN101911586A - Facilitating communication and power transfer between electrically-isolated powered device subsystems - Google Patents

Facilitating communication and power transfer between electrically-isolated powered device subsystems Download PDF

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Publication number
CN101911586A
CN101911586A CN2008801228380A CN200880122838A CN101911586A CN 101911586 A CN101911586 A CN 101911586A CN 2008801228380 A CN2008801228380 A CN 2008801228380A CN 200880122838 A CN200880122838 A CN 200880122838A CN 101911586 A CN101911586 A CN 101911586A
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subsystem
electric power
interface
pse
consumption equipment
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CN101911586B (en
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弗雷德里克·R·申德勒
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Cisco Technology Inc
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Cisco Technology Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/10—Current supply arrangements

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

A system employing power over Ethernet (PoE) technology may include at least one powered device and power sourcing equipment (PSE). The powered device may include a first powered device (PD) subsystem and a second powered device (PD) subsystem that is electrically isolated from the first PD subsystem. The powered device may also include an interface connecting the first PD subsystem and the second PD subsystem. The PSE may be operable to provide power to one or more of the PD subsystems through a link connecting the PSE to the powered device. Also, the first PD subsystem may be operable to receive a communication from and transfer power to the second PD subsystem through the interface while maintaining the electrical isolation.

Description

Communication and electric power between auxiliary electrically-isolated powered device subsystem are carried
Technical field
The disclosure generally relates to Power over Ethernet (PoE) technology.
Background technology
In Power over Ethernet (PoE) technology, supply unit (PSE) can provide electric power by the one or more power consumption equipments (PD) of standard multiple twin Ethernet cable in Ethernet.This technology may be to useful to network equipment power supply when not wishing to provide electric power by independent connection.For example, IP phone can be connected to the Ethernet cable that sends data and electric power is provided, and need not for example to provide via electrical socket another electric wire of electric power.IEEE 802.3 standard codes to the requirement of PoE equipment.Along with the time goes over, the complexity of PD increases.Along with the increase of complexity, the required electric power of these PD has also increased.
Description of drawings
In order to understand the present invention and advantage thereof more up hill and dale, with reference to the following description of carrying out in conjunction with the accompanying drawings, in the accompanying drawings:
Fig. 1 illustrates the system that the communication that is used between auxiliary electrically-isolated powered device (PD) subsystem and electric power are carried;
Fig. 2 illustrates the network equipment that auxiliary electrical is isolated the communication between the PD subsystem;
Fig. 3 illustrates and keeps the example interface that the electricity isolation allows to transmit by interface communication simultaneously;
Fig. 4 is the exemplary circuit that is used to report the electricity shortage of PD subsystem;
Fig. 5 A-5B illustrates and is used for isolating the exemplary circuit that transmits electric power between the PD subsystem at electricity; And
Fig. 6 illustrates the communication and the electric power that are used to utilize electricity to isolate between the PD subsystem to transport the flow chart that obtains electric power and report the method for power shortage situation.
Embodiment
General introduction
In specific embodiment, a kind of system comprises power consumption equipment and supply unit (PSE).Second power consumption equipment (PD) subsystem that power consumption equipment comprises first power consumption equipment (PD) subsystem, isolates with PD subsystem electricity, and the interface that connects a PD subsystem and the 2nd PD subsystem.Supply unit (PSE) is connected to power consumption equipment and can provides electric power by this chain road direction the one PD subsystem by link.The one PD subsystem can be by interface from the 2nd PD subsystem received communication, and can transmit electric power to the 2nd PD subsystem by interface.
In certain embodiments, a kind of method is included in PD subsystem place reception from the first electric power amount of PSE and from the sign of the 2nd PD subsystem reception to the second electric power amount.The second electric power scale shows the power shortage of the 2nd PD subsystem, and the 2nd PD subsystem and the isolation of PD subsystem electricity.This method also comprises based on the first electric power amount and the second electric power amount and determines whether and will transmit electric power to the 2nd PD subsystem from a PD subsystem, and the electricity of being kept when a PD subsystem is transported to the 2nd PD subsystem between a PD subsystem and the 2nd PD subsystem when electric power is isolated.
Describe
Fig. 1 always illustrates the system that communication between auxiliary electrically-isolated powered device (PD) subsystem and electric power are carried that is used for that indicates at 10 places.As shown in the figure, system 10 comprises network 12, supply unit (PSE) 14 and power consumption equipment 16, and power consumption equipment 16 comprises two PD subsystems 18 and interface 20.Link 22 is connected to power consumption equipment 16 and PD subsystem 18 thereof with supply unit 14.
Network 12 is connected to other equipment (not shown) and/or network (not shown) to the element in the system 10.In a particular embodiment, network 12 is parts of Ethernet.Network 12 can comprise any suitable communicator, comprises hardware and any suitable control logic.Network 12 can comprise Local Area Network, metropolitan area network (MAN), wide area network (WAN), the network that any other is public or privately owned, this locality, zone or global communication network, corporate intranet, the wired or wireless communication link that other are suitable, the perhaps combination in any of any one or a plurality of suitable networks.Network 12 can comprise the combination in any of gateway, router, hub, switch, access point, base station and any other realization appropriate protocol and hardware of communicating by letter or software.
Supply unit 14 provides electric power to power consumption equipment 16 and PD subsystem 18 thereof.Supply unit can be abbreviated as PSE.As shown in the figure, supply unit 14 provides electric power to power consumption equipment 16, PD subsystem 18a and PD subsystem 18b; Yet understand and to use any component configuration.For example, can adopt a plurality of PSE to provide electric power to power consumption equipment 16 and/or PD subsystem 18.Supply unit 14 can be end points PSE or span centre (midspan) PSE.End points PSE generates Ethernet data and comprises the circuit that is used for providing to power consumption equipment 16 electric power.On the other hand, span centre PSE between conventional Ethernet switch and one or more PD subsystem 18, thereby inject electric power not influencing under the data conditions that transmits.
In a particular embodiment, supply unit 14 is responsible for determining being used for the pattern of sending electric power to power consumption equipment 16 and/or PD subsystem 18.For example, IEEE 802.3 has described two kinds of enabled modes (being called Mode A and Mode B) that are used for transmitting to power consumption equipment 16 from supply unit 14 electric power.Under Mode A, pin one and 2 can form a side of service voltage, and pin 3 and 6 provides opposite side (being used for return voltage).Under Mode B, pin 4 and 5 can form a side of service voltage, and pin 7 and 8 provides opposite side (being used for return voltage).Under other patterns, different and/or other pairing can be used to provide voltage source (by service voltage-return voltage combination).In addition, in a particular embodiment, different and/or other pairing can be used to provide more than a voltage source.Each voltage source can be used to isolate 18 power supplies of PD subsystem to electricity.
Link 22 is connected to power consumption equipment 16 and PD subsystem 18 with supply unit 14.In a particular embodiment, link 22 is standard multiple twin Ethernet cables.Link 22 can comprise four pairings.In a particular embodiment, link 22 is used for two pairings are connected to PD subsystem 18 and other two pairings are connected to PD subsystem 18.By this way, link 22 can be so that each PD subsystem 18a, 18b can have the different voltage sources of isolating electrical path along electricity.In certain embodiments, link 22 comprises two or more standard ethernet cables.Link 22 can connect supply unit 14 and PD subsystem 18 in any appropriate manner, so that can transmit data when power consumption equipment 16 and/or PD subsystem 18 provide electric power from supply unit 14.
Power consumption equipment 16 can be configured to receive electric power and with system 10 in any equipment of element swap data.For example, power consumption equipment 16 can be IP (Internet Protocol) phone, network cameras (web camera), WAP (wireless access point), ethernet concentrator, and perhaps any other is configured to receive by standard multiple twin Ethernet cable the equipment of electric power.In illustrated embodiment, power consumption equipment 16 comprises two PD subsystems 18 and interface 20.Comprise single power consumption equipment 16 though system 10 is shown as, will understand that system 10 can comprise the power consumption equipment 16 of any proper number.For example, system 10 can comprise two power consumption equipments 16, and each power consumption equipment comprises among PD subsystem 18a, the 18b.
PD subsystem 18 is subsystem or the equipment by supply unit 14 power supplies.Generally speaking, each PD subsystem 18 comprises the circuit that is used to extract electric power.Each PD subsystem 18 can also with the devices exchange data in the system 10.In a particular embodiment, PD subsystem 18 and power consumption equipment 16 will be same.In certain embodiments, as illustrated among the embodiment, power consumption equipment 16 will comprise a plurality of PD subsystems 18.One or more in the PD subsystem 18 can be provided for detecting the existence of supply unit 14 and/or the function of availability.In a particular embodiment, one or more PD subsystems 18 provide IEEE detectability.
By comprising a plurality of PD subsystems 18, power consumption equipment 16 can make the parts electricity in the different PD subsystems 18 isolate.Parts are isolated make it possible to isolate electrical noise.For example, power consumption equipment 16 can be a network cameras, and this network cameras comprises camera motor (it for example can be PD subsystem 18a) and comprises the physical interface (it for example can be PD subsystem 18b) of camera control circuit.The camera motor circuit may electricly often be made a lot of noise, and camera control circuit often requires quietly power supply of electricity.Because these circuit are arranged in different PD subsystem 18a, 18b that electricity is isolated, therefore the electrical noise in PD subsystem 18 can not be sent to another PD subsystem 18.This can reduce at two PD subsystem 18a, 18b shares the filtration that will need under the situation of public power rail.
As another example, power consumption equipment 16 can be to benefit from the IP phone that electricity is isolated.This IP phone can comprise physical interface (it for example can be PD subsystem 18a) that comprises CPU and digital signal processor and the voicefrequency circuit (for example, PD subsystem 18b) that is used to drive loud speaker.Voicefrequency circuit may be to the electrical noise sensitivity.By PD subsystem 18a, 18b electricity is isolated, the filtration yield that needs in the IP phone can be reduced.
Interface 20 makes it possible to keep between PD subsystem 18 and communicates between these PD subsystems when electricity is isolated and/or the electric power conveying.Interface 20 can have any in the various configurations.The exemplary configuration that is designed to allow the interface 20 of communicating by letter is provided at Fig. 3 A, 3B and 3C.The exemplary configuration that allows the interface that electric power carries is provided at Fig. 2 (for example, switch 38) and Fig. 5 A and 5B.
Being used for the communication of 18 of auxiliary electrical isolation PD subsystems and the specific embodiment of the system that electric power is carried has obtained describing and not being intended to all-embracing.Though system 10 is shown as the element that comprises a certain configuration and layout, should be noted that this is a logical description, and the parts of system 10 and function on logic and entity can be according to circumstances combination, separate with distributed.For example, comprise two PD subsystems 18, will be appreciated that PD subsystem 18a, 18b can be the parts in any one or a plurality of suitable equipment though power consumption equipment 16 is shown as.For example, system 10 can assist communication and electric power between electricity isolation PD subsystem 18a, the 18b that is included in separately in the different power consumption equipments 16 to carry.In addition, as shown in the figure, system 10 only comprises a supply unit 14 that links to each other with two PD subsystems 18; Yet, in system 10, can use the supply unit 14 and the PD subsystem 18 of any suitable configuration and number.The function of describing at system 10 can be provided by any suitable element, carries with communication and electric power that auxiliary electrical is isolated between the PD subsystem.
Fig. 2 illustrates the power consumption equipment of the communication between auxiliary electrically-isolated powered device (PD) subsystem 34 that always indicates at 30 places.In illustrated embodiment, power consumption equipment 30 comprises that medium rely on 32, two PD subsystems of interface (MDI) 34a, 34b, interface 36, and switch 38.In a particular embodiment, power consumption equipment 30 is that power consumption equipment 16 and PD subsystem 34a, 34b are top PD subsystem 18a, the 18b that describes at Fig. 1.
Power consumption equipment 30 receives electric power via MDI 32 from supply unit (PSE).As shown in the figure, MDI shown in the common mode view and comprise four the pairing 44a, 44b, 44c and 44d.Each pairing 44 can obtain from the center tap that is used to make PHY be connected the transformer of isolating with corresponding Ethernet MDI.In a particular embodiment, pairing 44a is corresponding to the pairing (1,2) of standard multiple twin Ethernet cable; Pairing 44b is corresponding to the pairing (3,6) of standard multiple twin Ethernet cable; Pairing 44c is corresponding to the pairing (4,5) of standard multiple twin Ethernet cable; And pairing 44d is corresponding to the pairing (7,8) of standard multiple twin Ethernet cable.Comprise four pairings 44 though MDI 32 is described and is illustrated as, will be appreciated that MDI 32 can comprise the pairing 44 of any proper number or similar parts on function.
In certain embodiments, two pairings 44a, 44b are used for providing an electrical path to PD subsystem 34a, and two pairings 44c, 44d are used for providing second electrical path to PD subsystem 34b.By utilizing different pairings to provide different electrical path to each PD subsystem 34a, 34b, electric isolation can be kept.In addition, by using two different electrical path (using two pairings 44 separately), power consumption equipment 30 can make the available power that receives from supply unit 14 double effectively.
As shown in the figure, power consumption equipment 30 comprises two PD subsystem 34a, 34b.PD subsystem 34a can isolate with PD subsystem 34b electricity, as by shown in the isolation barrier 24.But PD subsystem 34a can communicate by letter with PD subsystem 34b and transmit electric power to PD subsystem 34b by interface 36.Similarly, in a particular embodiment, PD subsystem 34b can communicate by letter with PD subsystem 34a and transmit electric power to PD subsystem 34a by interface 36.
In illustrated embodiment, each PD subsystem 34 comprises corresponding controller 40 and parts 42.In a particular embodiment, controller 40 can use the electric power that receives from supply unit 14 to generate service voltage.In illustrated embodiment, the service voltage that is generated by the controller 40a among the PD subsystem 34a is marked as V A, and the service voltage that is generated by the controller 40b among the PD subsystem 34b is marked as V BThese service voltages are used by corresponding parts 42a, 42b.Parts 42 can be any equipment and/or the circuit in the power consumption equipment 30.For example, when power consumption equipment 30 was network cameras, parts 42a, 42b can be camera motor and the physical interface that comprises camera control circuit.As another example, when power consumption equipment 30 was IP phone, parts 42a, 42b were used to drive the voicefrequency circuit of loud speaker and comprise CPU and the physical interface of digital signal processor.
Interface 36 makes it possible to communicate and/or the electric power conveying 34 of PD subsystems when the electricity of keeping 34 of those PD subsystems is isolated.In a particular embodiment, interface 36 is top interfaces 20 of describing at Fig. 1.Interface 36 can have any in the various configurations, and has described the exemplary configuration of interface 36 at Fig. 3,5A and 5B.
Switch 38 can be included in the power consumption equipment 30 so that power consumption equipment 30 can transmit electric power between PD subsystem 34a, 34b.In a particular embodiment, power consumption equipment 30 can comprise that switch 38 is with interoperability auxiliary and old system.Power consumption equipment 30 can Closing Switch 38 be transported to pairing 44c, 44d to the electric power that receives on pairing 44a, 44b, perhaps vice versa.Similarly, if PD subsystem 34a, 34b obtain electric power from PSE, switch 38 can be opened so.In a particular embodiment, one of PD subsystem 34a, 34b open switch 38 after the communication that receives from another PD subsystem 34.This communication can show that another PD subsystem 34 has begun to receive enough electric power from PSE.Yet by Closing Switch 38, power consumption equipment can reduce or eliminate the electricity of before safeguarding between PD subsystem 34a and PD subsystem 34b isolates.Therefore, in certain embodiments, switch 38 be included in the power consumption equipment 30 and and if only if power consumption equipment 30 be used when needing a subsystem of the power shortage among PD subsystem 34a, the 34b to receive electric power.In certain embodiments, switch 38 is by PD subsystem 34 power supplies that power at first and the electronic switch or the relay of control.Switch 38 can be used to provide electric power to operating the indicating circuit of reporting the power shortage situation.In certain embodiments, switch 38 connects V when being closed AAnd V BEven this can be so that PSE also can detect the PD subsystem 34 of power shortage effectively when it receives electric power by switch 38.In a particular embodiment, power consumption equipment 30 does not comprise switch 38.
In operation, power consumption equipment 30 is powered by PSE.PSE can be similar to supply unit 14 substantially.In case it receives electric power, power consumption equipment 30 just can judge whether PSE is just sending the electric power of q.s for the operation of power consumption equipment 30.In order to carry out this judgement, PD subsystem 34a can communicate by letter with PD subsystem 34b.For example, PD subsystem 34a can notify its power shortage to PD subsystem 34b.Power shortage can indicate the electric power amount that PD subsystem 34a also needs the electric power that is receiving from PSE except PD subsystem 34a.Similarly, PD subsystem 34b can notify its power shortage to PD subsystem 34a.If the electric power total amount that PD subsystem 34a and PD subsystem 34b are received is greater than or equal to the required electric power total amount of PD subsystem 34a, 34b, power consumption equipment 30 can judge that it is powered fully so.
Otherwise power consumption equipment 30 decidable power shortage situations take place.In response, power consumption equipment 30 these power shortage situations of report.In a particular embodiment, power consumption equipment 30 can use the circuit that is powered in the PD subsystem 34 to report the power shortage situation.For example, the subsystem that is powered in the PD subsystem 34 can comprise physical interface and control circuit, and its PSE or control appliance that can be used in system 10 sends the message that indicates the power shortage state.In certain embodiments, power consumption equipment 30 can use indicating circuit to report the power shortage situation.An example of this indicating circuit has been shown and has described at Fig. 4.Though these two concrete examples are described, understand that power consumption equipment 30 (perhaps in its parts one or more) can utilize any proper method to report the power shortage situation.
In addition, when the power shortage situation took place, power consumption equipment 30 can make full use of the electric power that PSE provides.In a particular embodiment, power consumption equipment 30 is transported to the PD subsystem 34 that is not powered (perhaps electricity shortage) to electric power from the PD subsystem 34 that is powered.In certain embodiments, though power consumption equipment 30 can judge that the electricity shortage situation does not take place should transmit electric power yet.For example, a PD subsystem 34 may be electricity shortage, and another PD subsystem 34 has sufficient electric power.Under these situations, power consumption equipment 30 can be electric power from being powered the PD subsystem 34 that PD subsystem 34 is transported to electricity shortage.In Fig. 5 A and 5B, illustrate and described to make it possible to keeping and carry out the exemplary circuit that this electric power is carried when electricity is isolated.
Generally speaking, PD subsystem 34a, 34b can communicate and pull together to assemble its electricity needs, thereby to the sufficient total electricity (following the standard that limits electric power that each electrical path provides simultaneously) of PSE request, control the circuit operation in another PD subsystem 34, and/or realize other suitable targets.Diagram and having described makes it possible to the exemplary circuit that communicates when electricity is isolated keeping in Fig. 3.Can be under communication and situation about transmitting electric power between the PD subsystem 34, two PD subsystems 34 can be worked together and be consulted the electric power that PSE provides.Described decision and the judgement that belongs to power consumption equipment 30 can be controlled by simple hardware circuit, perhaps can realize that software generates by microprocessor.
The specific embodiment that is used for the power consumption equipment of the communication between auxiliary electrically-isolated powered device has obtained describing and not being intended to all-embracing.Though power consumption equipment 30 is shown as the element that comprises a certain configuration and layout, should be noted that this is a logical description, and the parts of power consumption equipment 30 and function on logic and entity can be according to circumstances combination, separate with distributed.For example, comprise two PD subsystems 34, will be appreciated that power consumption equipment 30 can comprise the PD subsystem 34 of any proper number though power consumption equipment 30 is shown as.In certain embodiments, system 10 comprises at least two power consumption equipments 30 that have a PD subsystem 34 separately, and wherein two PD subsystems 34 in these two power consumption equipments 30 can be communicated by letter and transmit electric power by interface 36.As another example, MDI 32 can be or can not be parts in the power consumption equipment 30.And, as last example,, MDI 32 comprises four pairings 44 though being shown as, will be appreciated that MDI32 can comprise any suitable parts that are used for providing to power consumption equipment 30 the different electrical path of any number.
Fig. 3 illustrates when allowing by interface transmission communication and keeps three example interface that electricity is isolated.As shown in the figure, Fig. 3 shows capacitive coupling interface 50, transformer coupled interface 52 and photoelectricity coupling (opto-coupler) interface 54.In a particular embodiment, interface 36 (top at Fig. 2 describe) is capacitive coupling interface 50, transformer coupled interface 52 or photoelectricity coupling interface 54.
In a particular embodiment, capacitive coupling interface 50 is used so that can communicate when keeping the electricity isolation.For example, capacitive coupling interface 50 can allow to communicate between the PD subsystem 18,34 that electricity is isolated.Capacitive coupling interface 50 can keep the electricity isolation by the amount that reduces or eliminate the direct current (DC) that can flow between isolated part.As shown in the figure, capacitive coupling interface 50 comprises two series capacitors 56a, 56b and strides V OUTAnother capacitor 56c that connects these two series capacitors.In operation, capacitive coupling interface 50 receive with the time time-dependent current encoded signals.This signal is at V INThe place receives.Because signal has alternating voltage, so signal can be filtered by minimum level ground during by capacitor 56a, 56b, 56c at it.Therefore, capacitive coupling interface 50 can be from V when keeping electricity to isolate INTo V OUTSend signal.The signal that capacitive coupling interface 50 transmits on can the either direction of relaying in both direction.
In certain embodiments, transformer coupled interface 52 is used, so that can communicate when keeping electricity to isolate.For example, transformer coupled interface 52 can allow to communicate between the PD subsystem 18,34 that electricity is isolated.Transformer coupled interface 52 can keep the electricity isolation by the amount that reduces or eliminate the DC electric current that can flow between isolated part.As shown in the figure, transformer coupled interface 52 comprises having N: the isolating transformer of 1 ratio.One side of transformer is connected to V IN, and opposite side is connected to V OUTTransformer is isolated direct current (DC) electricity, but time time-dependent current component that can repeating signal.Therefore, transformer coupled interface 52 can allow to communicate when keeping electricity to isolate.The signal that transformer coupled interface 52 transmits on can the either direction of relaying in both direction.
In certain embodiments, photoelectricity coupling interface 54 is used with permission and communicates when keeping electricity to isolate.For example, photoelectricity coupling interface 54 can allow to communicate between the PD subsystem 18,34 that electricity is isolated.Photoelectricity coupling interface 54 can be from V by reducing or eliminating INFlow to V OUTThe amount of direct current (DC) keep electricity to isolate.Illustrated photoelectricity coupling interface 54 comprises elements such as light-emitting diode (LED) 58 and photistor 60.In embodiment illustrated in the photoelectricity coupling interface 54, data are by V INReceive, thereby make voltage in the output of amplifier 62 greater than reference voltage.Electric current will flow through LED 58, thereby make LED produce light.This light is sensed by transistor 60, and transistor 60 is from high voltage (V S) obtain electric current.Whether the existence of this electric current directly influences the output of amplifier 64, i.e. V OUTBy this process, photoelectricity coupling interface 54 can send to V to the signal that receives when keeping electricity to isolate OUTIn illustrated embodiment, photoelectricity coupling interface 54 only can relaying in a direction (from V INTo V OUT) the last signal that transmits.Yet, will be appreciated that similar circuit can be included to allow the communication on the rightabout.In a particular embodiment, photoelectricity coupling interface 54 can receive the difference input, for example makes LED 58 be driven when positive input is detected, and is not driven when being detected in negative input.Comprise and being connected of reference voltage or ground voltage though photoelectricity coupling interface 54 is shown as, will be appreciated that any suitable voltage can be used to replace these connections.
The specific embodiment of network device interface has obtained describing and not being intended to all-embracing.Though capacitive coupling interface 50, transformer coupled interface 52 and photoelectricity coupling interface 54 are shown as the element that comprises a certain configuration and layout separately, should be noted that these are example.Element in these interfaces 50,52,54 can be according to circumstances combination, separate with distributed.Power consumption equipment and/or one or more PD subsystem can use and keep electric any one of isolating or a plurality of suitable interface when permission communicates by interface.
Fig. 4 is the exemplary circuit that is used to report 34 electricity shortages of PD subsystem that always indicates at 80 places.As top brief description, power consumption equipment 30 can provide a notice, i.e. its electricity shortage.The electricity shortage situation may take place when power consumption equipment 30 is connected to old supply unit.In illustrated embodiment, circuit 80 is designed to report when PD subsystem 34a electricity shortage.Similarly circuit also can be comprised, to report when PD subsystem 34b, power consumption equipment 30 or other power consumption equipments or the electricity shortage of PD subsystem.
Circuit 80 is connected to V S-A, V S-BAnd ground.As shown in the figure, V S-A Be PD subsystem 34a service voltage and can be from V A(offering the voltage of the parts 42a among the PD subsystem 34a) obtains.As shown in the figure, V S-BBe PD subsystem 34b service voltage and can be from V B(offering the voltage of the parts 42b among the PD subsystem 34b) obtains.Have these exemplary connections though circuit 80 is shown as, will be appreciated that any appropriate voltage can be connected to circuit 80.For example, be shown as the part that is connected to public ground in the circuit 80 and can be connected to any one or a plurality of suitable reference voltage.
In illustrated embodiment, circuit 80 comprises two light-emitting diodes (LED) 82,84, photistor 86, regular transistor 88, and two resistors 82,84.When PD subsystem 34b is powered and PD subsystem 34a when not being powered (perhaps electricity shortage) V S-ATo approximate 0V and V greatly S-BTo have a voltage (in other words, will be sufficiently more than 0V).At V S-AUnder the non-existent situation, LED 82 will not lighted.This will make transistor 86 not be driven, thereby cause the high voltage at the base stage place of transistor 88.(transistor 88 can be bipolar transistor, mosfet transistor, perhaps any other suitable parts.) this high base stage is driving transistors 88, thereby make the electric current LED 84 that flows through.Therefore, LED 84 can be lighted when PD subsystem 18a electricity shortage.
The specific embodiment of circuit that is used for the parts electricity shortage of reporting ent equipment has obtained describing and not being intended to all-embracing.Though circuit 80 is shown as the element that comprises a certain configuration and layout, should be noted that this is an example.Element in this circuit can be according to circumstances combination, separate with distributed.Comprise in the circuit 80 some that describe or all element or the different circuit that do not comprise the element of describing in the circuit 80 can be used to report the electricity shortage of the parts in the power consumption equipment.
Fig. 5 A-5B illustrates and is used for isolating the exemplary circuit that transmits electric power between the PD subsystem at electricity.Fig. 5 A illustrates and is used for the circuit 100 that transmits electric power to the 2nd PD subsystem 34b from a PD subsystem 34a.In Shuo Ming the example, suppose that PD subsystem 34a is powered and PD subsystem 34b is not powered below.V INThe service voltage that can be connected to power supply PD subsystem 34a (is V in this example S-A), and V OUTThe service voltage that can be connected to the PD subsystem 34b that do not power (is V in this example S-B).
As shown in the figure, circuit 100 comprises three capacitor 102a, 102b, 102c and switch 104.In exemplary operations, switch 104 can be by with the characteristic frequency open and close, so that electric power is transported to the PD subsystem of not powering (in this example from PD subsystem 34a to PD subsystem 34b) from power supply PD subsystem 18.In exemplary operation, switch 104 can be by the speed open and close with " f " with nominal 50% duty ratio.The value of selected duty ratio and capacitor 102a, 102b, 102c will change available output current (I OUT) and average output voltage (V OUT).In illustrated embodiment, I OUT, V OUT, V IN, f and capacitor 102a, 102b and 102c value (being respectively C1, C2 and C3) between relation provide by following formula:
I OUT≤-C 3(V IN-V OUT)f V OUT ≤ V IN ( C 1 C 2 C 1 + C 2 ) / ( C 1 C 2 C 1 + C 2 + C 3 )
In a particular embodiment, circuit 100 also comprises filter and/or voltage regulator circuit.In certain embodiments, use diode to come place of switches 104, perhaps except switch 104, also use diode.This diode can be designed at V INConducting and at V when having (for example, greater than 0V) INPrevent conducting when not having (for example approximating 0V greatly).
In certain embodiments, circuit 100 electric power that offers PD subsystem 34b is less than the electric power that PD subsystem 34b can directly obtain by supply unit 14 power supplies the time.Yet circuit 100 can make it possible at PD subsystem 34b otherwise finish the Min. circuit function will keep not being powered the time in PD subsystem 34b.For example, power consumption equipment 30 can be that IP phone and PD subsystem 34b can be the audio frequency subdivisions of IP phone, and it drives receiver and speaker-phone.If PD subsystem 34b directly obtains electric power from supply unit 14, PD subsystem 34b can have enough electric power and uses receiver and/or speaker-phone so.Yet ifs circuit 100 transmits electric power to PD subsystem 34b from PD subsystem 34a, and PD subsystem 34b may only have enough electric power to operate the receiver of IP phone so.
Though circuit 100 has been described to transmit electric power to PD subsystem 34b from PD subsystem 34a, will be appreciated that these principles are applicable to the electric power conveying from PD subsystem 34b to PD subsystem 34a comparably.In this case, V INCan be connected to the service voltage (V of PD subsystem 34b S-B), and V OUTCan be connected to the service voltage (V of PD subsystem 34a S-A).
Fig. 5 B illustrates another exemplary circuit 110 that is used for transmitting electric power between PD subsystem 34.As shown in the figure, circuit 110 is connected to V A, V S-A, V B, V S-BAnd ground.V AAnd V BCan be voltage corresponding to the electric power that receives from supply unit 14, and V S-AAnd V S-BCan be the parts 42a among PD subsystem 34a, the 34b, the service voltage that 42b uses respectively.In the exemplary embodiment, circuit 110 uses in power consumption equipment 16, and wherein power consumption equipment 16 is the network cameras that comprise two PD subsystem 34a, 34b.PD subsystem 34a can comprise CPU and signal processing circuit, and PD subsystem 34b can comprise pitching (tilt), yawing (pan) and zoom motor.For this embodiment, V S-ACan be to be used for service voltage to the power supply of CPU and signal processing circuit, and V S-BCan be to be used for service voltage to the power supply of the motor of camera.Have these exemplary connections though circuit 110 is shown as, will be appreciated that any suitable voltage can be connected to circuit 110.For example, be shown as the part that is connected to public ground in the circuit 110 and can be connected to different earthed voltages.
Circuit 110 comprises that inverse-excitation type (flyback) DC designs to DC.In illustrated embodiment, circuit 110 comprises switch 112,114,116, and synchronous rectifier 118,120 comprises the transformer 122 of inductance 124a, 124b, 124c, and the transformer 126 that comprises inductance 128a, 128b, 128c.The electric power amount that the electric power that switch 112,114 can be controlled to be provided from supply unit obtains.Switch 116 can be controlled at the electric power amount of carrying between PD subsystem 34a, the 34b.Synchronous rectifier 118 and transformer 122 (and inductance 124a, 124b, 124c) can be worked with from V with other circuit elements AThe electric power of (perhaps electronic circuit 134b) is transported to service voltage V S-ASimilarly, synchronous rectifier 120 and transformer 126 (and inductance 128a, 128b, 128c) can be worked with from V with other circuit elements BThe electric power of (perhaps electronic circuit 134a) is transported to service voltage V S-B
In illustrative case, PD subsystem 34a, 34b are powered.In a particular embodiment, as PD subsystem 34a, when 34b is powered, between PD subsystem 34a, 34b, do not transmit electric power.In this case, switch 116 stays open and electronic circuit 134a, 134b operate independently of one another.For example in electronic circuit 134a, switch 112 can be by sequentially closed, with cumlative energy in inductance 124a, 124b.This energy can be by from V AExtract.Synchronous rectifier 118 can operate then with from inductance 124 to V S-AConveying capacity.In a particular embodiment, electronic circuit 134a and its element are controlled by PD subsystem 34a.In a similar way, electronic circuit 134b can use switch 114, inductance 128a, 128b and synchronous rectifier 120 to come from V BTo V S-BConveying capacity.Electronic circuit 134b and element thereof are controlled by PD subsystem 34b.
In second illustrative case, have only one to be powered among PD subsystem 34a, the 34b.When having only one to be powered (and another is not powered) in the PD subsystem 34, switch 116 can be controlled to energy is transported to and is not powered PD subsystem 34 from being powered PD subsystem 34.For the purpose of this example, suppose that PD subsystem 34a is powered, and PD subsystem 34b is not powered.In this example, V AHas voltage (for example, V A＞0V), and VB does not have voltage (for example, V B～0V).
Switch 116 can be controlled at the electric power amount that (being to PD subsystem 34b in this case from PD subsystem 34a) carries between the PD subsystem 34.In a particular embodiment, switch 116 is by speed " f " open and close to have nominal 50% duty ratio.Selected duty ratio can change the electric current carried and the amount of voltage.The time span that switch 116 is closed can determine to be transported to from PD subsystem 34a the electric power amount of PD subsystem 34b.By open and close switch 116, energy is transported to transformer 126 by inductance 124c, 128c from transformer 122.Transformer 126 then can be energy delivery to inductance 128a, 128b.As described above, but electronic circuit 134b Be Controlled makes energy to be transported to V from transformer 126 (and inductance 128a, 128b) S-B
At the exemplary operation that is used for transmitting electric power under this second situation, switch 112 at first is closed, with energy from V ABe transported to transformer 122.Then, switch 116 is closed, so that energy is transported to transformer 126 from transformer 122.After energy was carried, switch 112 and switch 116 all can be opened.Meanwhile, synchronous rectifier 118,120 can be unlocked, so that energy is transported to V respectively from transformer 122,126 S-AAnd V S-BThis exemplary operation can repeat then, so that the mobile continuation of electric power.
In the 3rd example scenario, PD subsystem 34a, 34b all are powered, and circuit 110 is used for transmitting electric power between PD subsystem 34a, 34b.The 3rd exemplary operation can use and the operation similar operation of describing at second exemplary operation.For example, switch 112 can be closed, with energy from V ABe transported to transformer 122, and switch 114 can be closed, with energy from V BBe transported to transformer 126.Then, switch 114 can be opened simultaneously that switch 116 is closed, so that energy is transported to transformer 126 from transformer 122.After energy was carried, switch 112,116 can be opened.Meanwhile, synchronous rectifier 118,120 can be unlocked, so that energy is transported to V respectively from transformer 122,126 S-AAnd V S-BThis exemplary operation can repeat then, so that the mobile continuation of electric power.
By using circuit 110, can be at power supply service voltage (for example, the V in keeping each PD subsystem 34a, 34b S-AAnd V S-B) finish electric power the time electrically isolated from one and carry.In certain embodiments, power supply PD subsystem 34 is from (for example, working as V S-A≈ V S-BDuring ≈ 0) up to service voltage (for example, the V of the PD subsystem 34 of not powering S-APerhaps V S-B) arrive control switch 116 till the predeterminated level.The service voltage of PD subsystem 34 has not reached certain level in case power, and the control to switch 116 can pass to the PD subsystem 34 of not powering so.In a particular embodiment, switch 116 only is closed when switch 112 and switch 114 all are closed.In addition, in illustrated embodiment, circuit 110 is reduced to the inductance coupling high mechanism that highlights.In other embodiments, circuit 110 can comprise any suitable extra and/or substitutions of elements.
The specific embodiment that is used for the circuit that transmits electric power between the power consumption equipment that electricity is isolated has obtained describing and not being intended to all-embracing.Though circuit 100 and circuit 110 are shown as the element that comprises a certain configuration and layout, should be noted that this is an example.Element in this circuit can be according to circumstances combination, separate with distributed.For example, circuit 110 can comprise or can not comprise inductance 124b, 128b.In a particular embodiment, circuit 110 only comprises among inductance 124b, the 128b, makes all electric power that receive can be transported to public service voltage (V S-APerhaps V S-B).As another example, circuit 110 can comprise single transformer 122,126.In certain embodiments, circuit 110 can combined transformer 122,126, removes inductance 124c, 128c, and out of phase console switch 112,114 electric power is transported to each service voltage.As the 3rd example, circuit 110 can make up service voltage (V in any suitable mode known to those skilled in the art S-APerhaps V S-B).
Comprise in the circuit 100,110 some that describe or all element or the different circuit that do not comprise the element of describing in the circuit 100,110 can be used to transmit electric power between the PD subsystem that electricity is isolated.In a particular embodiment, power consumption equipment 30 comprises switch 38 transmitting electric power between different PD subsystems 34, but not uses circuit 100 or circuit 110.
Fig. 6 is that the communication and the electric power that illustrate between the electric PD subsystem of isolating of the utilization that always indicates at 150 places transport the flow chart that obtains electric power and report the method for electricity shortage situation.
At step 152 place, one or more among PD subsystem 34a, the 34b receive electric power from supply unit 14.At step 154 place, the amount of the electric power that PD subsystem 34a, 34b just receive from supply unit 14 communicates.This communication can also provide the indication to power shortage.Power shortage can represent specific PD subsystem 34 except by supply unit 14 actual reception to electric power the amount of the electric power that also needs.In a particular embodiment, power shortage indicates the electric power when specific PD subsystem 34 receives above its demand.After PD subsystem 34a, 34b communicated with regard to the electric power that receives, PD subsystem 34a can judge in step 156 whether the received total electricity of two PD subsystems 34 is enough.If electric power is enough, method 150 proceeds to step 166 so.
Otherwise at step 158 place, whether PD subsystem 34a judges will report the electricity shortage situation.If PD subsystem 34a decision report electricity shortage situation provides the indication to the electricity shortage state so in step 160.In a particular embodiment, the circuit that comprises light-emitting diode (LED) makes that LED is lighted, so that the indication to the electricity shortage state to be provided.In certain embodiments, in the PD subsystem 34a be powered circuit generate message and send it to supply unit 14 or system 10 in another equipment.This message can provide to the indication of electricity shortage state and about the information of electricity shortage state.
At step 162 place, PD subsystem 34a judges whether need transmit electric power between PD subsystem 34a and PD subsystem 34b.If will transmit electric power, PD subsystem 34a initiates the electric power conveying at step 164 place so.In a particular embodiment, PD subsystem 34a utilizes inverse-excitation type DC to the DC circuit electric power to be transported to PD subsystem 34b.Illustrated and described the example of suitable inverse-excitation type DC at Fig. 5 B to the DC circuit.In case electric power is carried and finished, method 150 finishes so.
At step 166 place, whether each among PD subsystem 34a judgement PD subsystem 34a, the 34b has enough electric power.In a particular embodiment, even the received electric power total amount of PD subsystem 34a and PD subsystem 34b is enough for its requirements of combination, PD subsystem 34b will not have enough electric power yet.Do not have enough electric power if PD subsystem 34a judges one of PD subsystem 34, method 150 turns back to step 164 so, carries at the electric power that step 164 place initiates between PD subsystem 34a, 34b.Otherwise method 150 finishes.
The method of describing at Fig. 6 only is exemplary, and understands retouching operation mode in any appropriate manner and the equipment that is indicated as executable operations.Though this method has been described the particular step of carrying out with certain order, but be understood that system 10 anticipates any suitable set and the layout of carrying out the element of some in these steps, whole or zero with any order of operation.For example, though PD subsystem 34a is described to carry out various steps, any suitable parts (comprising power consumption equipment 30 and/or PD subsystem 34b) can be carried out these steps.In addition, described decision and judgement can be controlled by simple hardware circuit, perhaps can realize that software generates by microprocessor.
Though in some embodiment, described the present invention, it may occur to persons skilled in the art that a large amount of changes and modification, and the present invention is intended to comprise this change and the modification that falls in the claims.

Claims (20)

1. system comprises:
Power consumption equipment comprises:
First power consumption equipment (PD) subsystem;
Second power consumption equipment (PD) subsystem with the isolation of described PD subsystem electricity;
The interface that connects a described PD subsystem and described the 2nd PD subsystem; And
Supply unit (PSE), it links to each other by link with described power consumption equipment and can operate by the described PD subsystem of described chain road direction provides electric power;
Wherein, a described PD subsystem can be operated by described interface from described the 2nd PD subsystem received communication.
2. the system as claimed in claim 1, wherein, a described PD subsystem also can be operated by described interface and transmit electric power to described the 2nd PD subsystem.
3. the system as claimed in claim 1, wherein, described interface comprises one or more in the following circuit: capacitive coupling interface, transformer coupled interface, photoelectricity coupling interface and inverse-excitation type DC are to the DC circuit.
4. the system as claimed in claim 1, wherein:
Described PSE also can operate by described the 2nd PD subsystem of described chain road direction provides electric power; And
Described the 2nd PD subsystem can be operated by described interface from a described PD subsystem received communication, and can operate by described interface and transmit electric power to a described PD subsystem.
5. the system as claimed in claim 1, wherein:
Described link comprises the standard multiple twin Ethernet cable that comprises four pairings;
Described PSE can operate by first pairing of described link and second pairing provides electric power to a described PD subsystem; And
Described PSE also can operate by the 3rd pairing of described link and the 4th pairing provides electric power to described the 2nd PD subsystem.
6. the system as claimed in claim 1, wherein, a described PD subsystem and described the 2nd PD subsystem communicate, thereby:
Determine the total electricity level of the electricity needs of described PD subsystem of expression and described the 2nd PD subsystem; And
Described total electricity level is compared with the level of power that receives, and the described level of power that receives is represented the electric power that a described PD subsystem and described the 2nd PD subsystem receive from described PSE.
7. system as claimed in claim 6, wherein, an indicating circuit can be provided by the indication that comes to provide when the described level of power that receives is lower than described total electricity level to described power consumption equipment electricity shortage.
8. the system as claimed in claim 1, wherein, a described PD subsystem can be operated when described communication shows described the 2nd PD subsystem electricity shortage and transmit electric power to described the 2nd PD subsystem.
9. the system as claimed in claim 1, wherein, a described PD subsystem can be operated and utilize inverse-excitation type DC to transmit electric power to described the 2nd PD subsystem by described interface to the DC circuit.
10. method comprises:
Receive the first electric power amount at first power consumption equipment (PD) subsystem place from supply unit (PSE), the described first electric power amount is to receive on the link that described PSE is connected to power consumption equipment, described power consumption equipment comprises a described PD subsystem and second power consumption equipment (PD) subsystem, and described the 2nd PD subsystem and described PD subsystem electricity are isolated;
From the sign of described the 2nd PD subsystem reception to the second electric power amount, the described second electric power scale shows the power shortage of described the 2nd PD subsystem;
Based on described first electric power amount and the described second electric power amount, determine whether and to transmit electric power to described the 2nd PD subsystem from a described PD subsystem;
When from a described PD subsystem when described the 2nd PD subsystem transmits electric power, the electricity of keeping between a described PD subsystem and described the 2nd PD subsystem is isolated.
11. method as claimed in claim 10, wherein:
Interface connects a described PD subsystem and described the 2nd PD subsystem; And
A described PD subsystem can be operated by described interface from described the 2nd PD subsystem received communication, and can operate by described interface and transmit electric power to described the 2nd PD subsystem.
12. method as claimed in claim 11, wherein, described interface comprises one or more in the following circuit: capacitive coupling interface, transformer coupled interface, photoelectricity coupling interface and inverse-excitation type DC are to the DC circuit.
13. method as claimed in claim 10, wherein:
Described link comprises the standard multiple twin Ethernet cable that comprises four pairings;
Described PSE can operate by first pairing of described link and second pairing provides electric power to a described PD subsystem; And
Described PSE also can operate by the 3rd pairing of described link and the 4th pairing provides electric power to described the 2nd PD subsystem.
14. method as claimed in claim 10 also comprises:
Determine the total electricity level of the electricity needs of described PD subsystem of expression and described the 2nd PD subsystem; And
Described total electricity level is compared with the level of power that receives, and the described level of power that receives is represented the electric power that a described PD subsystem and described the 2nd PD subsystem receive from described PSE.
15. method as claimed in claim 14, wherein, an indicating circuit can be provided by the indication that comes to provide when the described level of power that receives is lower than described total electricity level to described power consumption equipment electricity shortage.
16. method as claimed in claim 10, wherein, described sign to the second electric power amount indicates one of the following:
Described the 2nd PD subsystem has sufficient electric power, and
The electric power requirement of described the 2nd PD subsystem.
17. whether method as claimed in claim 10 wherein, to transmitting electric power was determined to comprise:
Discern the 3rd electric power amount, described the 3rd electric power scale shows the electricity needs of a described PD subsystem;
If the described first electric power amount transmits electric power to described the 2nd PD subsystem from a described PD subsystem so greater than described second electric power amount and described the 3rd electric power amount sum.
18. method as claimed in claim 10, wherein, a described PD subsystem can be operated and utilize inverse-excitation type DC to transmit electric power to described the 2nd PD subsystem to the DC circuit.
19. a device comprises:
First power consumption equipment (PD) subsystem can be operated from supply unit (PSE) to receive the first electric power amount, and the described first electric power amount is to receive on the link that described PSE is connected to a described PD subsystem;
With second power consumption equipment (PD) subsystem that described PD subsystem electricity is isolated, described the 2nd PD subsystem can be operated to receive the second electric power amount from described PSE on described link, and described link also is connected to described the 2nd PD subsystem to described PSE; And
The interface that connects a described PD subsystem and described the 2nd PD subsystem;
Wherein, a described PD subsystem can be operated by described interface from described the 2nd PD subsystem received communication, and can operate by described interface and transmit electric power to described the 2nd PD subsystem.
20. device as claimed in claim 19, wherein:
Described link comprises the standard multiple twin Ethernet cable that comprises four pairings;
Described PSE is connected to a described PD subsystem by first pairing and second pairing of described link; And
Described PSE is connected to described the 2nd PD subsystem by the 3rd pairing and the 4th pairing of described link.
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